*{margin: 0 auto; padding: 0;}
html,body{
	width: 100%;
	height: 100%
}

.all_bg{
	margin-top:10px;
	width: 800px;
	height:600px;
}

#allcanvas{
	position: relative;
	width:100%;
	height:100%;
}
.canvas{
	position:absolute;
	left:0; top:0;
}
#canvas1{
	z-index: 1;
}
#canvas2{
	z-index:0;
}